Temperature Compensation; Serial Communication Board; Cable Glands - ABB AW400 Series Instruction Manual

Fig. 7 – Analog Input /Output terminal barrier
3.4.3.1

Temperature compensation

The thermo-compensation Pt100 is not necessarily present in each sensor, in fact in some installations the
different sensors are installed in the same cell, and therefore the reference temperature can be read from one
input only, namely from the sensor connected to channel 1.
In the installation menu, when configuring channel 2 and 3, after the choice of the type of sensor, it is
requested to specify if the reference temperature is to be "equal to first channel" or "independent". In the first
case the reference temperature for that channel is taken from channel 1, in the second case it is read from its
own Pt thermo-resistance which in this case must be present.
This option is not applicable for mA and ORP inputs measurements, as these parameters are not influenced
by operating temperature.
3.4.4

Serial communication board

AW400 supports serial communication standards RS232 and RS422/485 by connection of a modular
telephone jack RJ45.
The 9 poles terminal board supports all three standards.
The pin-out of the RJ45 connectors and 9-pin terminal board is illustrated in Section 11.3 in this manual,
dealing with the serial communication option.
3.4.5

Cable glands

The instrument case houses 9 pre-formed holes that can be opened for wiring entrance. Five of them are
made ready for use in the factory and protected.
AW400 fully wired is connected as follows (Fig 8):
•
1 three-core cable for power supply
•
cables from sensors
•
cables for 4–20 mA retransmission
•
wires for digital outputs (CCO1–7)
•
2 two-core cable for digital inputs (CCI1–2)
•
1 three-core cable for serial link (or cable with modular telephone jack RJ45 type)
18
µ A in from
mV in from
Out
sensors
sensors
(pH,ORP)
mA Cl,CD,O3
or 0/4-20
mA
Temperature
Pt100